adjective

- The definition of normal is regular, natural or staying with the general standard.
An example of normal is a human temperature of 98.6.

- Normal is defined as the usual or the average.
An example of normal is the general amount of goods that a company makes each year.

## normal

- conforming with or constituting an accepted standard, model, or pattern; esp., corresponding to the median or average of a large group in type, appearance, achievement, function, development, etc.; natural; usual; standard; regular
- Biol. occurring naturally:
*normal*immunity - Chem.
- designating or of a salt formed by replacing all the replaceable hydrogen of an acid with a metal or metals
- designating or of a solution which contains an amount of the dissolved substance chemically equivalent to one gram atom of hydrogen per liter of solution
- designating or of a fatty hydrocarbon, the chain of which is continuous rather than branched, in which no carbon atom is united directly to more than two others

- Math. perpendicular; at right angles
- free from disease, disorder, or malformation; specif., average in intelligence or development
- mentally sound

Origin of normal

Classical Latin*normalis*; from

*norma*, a rule: see norm

- anything normal
- the usual state, amount, degree, etc.; esp., the median or average
- Math. a perpendicular; esp., a perpendicular to a line tangent to a curve, at its point of tangency

## Normal

A town of central Illinois near Bloomington. It is the seat of Illinois State University, founded as a normal school in 1857.

### normal

adjective

- Conforming with, adhering to, or constituting a norm, standard, pattern, level, or type; typical:
*normal room temperature; one's normal weight; normal diplomatic relations.* -
*Biology*Functioning or occurring in a natural way; lacking observable abnormalities or deficiencies. -
*Chemistry***a.**Relating to or designating the normality of a solution.**b.***Abbr.***n**Designating an aliphatic hydrocarbon having an acyclic unbranched chain of carbon atoms. -
*Mathematics***a.**Being at right angles; perpendicular.**b.**Perpendicular to the direction of a tangent line to a curve or a tangent plane to a surface. **a.**Relating to or characterized by average intelligence or development.**b.**Free from mental illness; sane.

noun

- The usual, expected, or standard state, form, amount, or degree:
*Temperatures have been above normal for this time of year.* -
*Mathematics*A perpendicular, especially a perpendicular to a line tangent to a plane curve or to a plane tangent to a space curve.

Origin of normal

Middle English, from Late Latin*norm&amacron;lis*, from Latin,

*made according to the square*, from

*norma*,

*carpenter's square*; see

*gn&omacron;-*in Indo-European roots.

*Related Forms:*

**nor′mal·ly**adverb

## normal

Adjective

(*comparative* more normal, *superlative* most normal)

- According to norms or rules.
*Organize the data into third normal form.*

- Usual; ordinary.
*Felicia baked the bread the normal way.*

- Healthy; not sick or ill.
*John is feeling normal again.*

- Pertaining to a school to teach teachers how to teach.
*My grandmother attended Mankato State Normal School.*

- (chemistry) Of, relating to, or being a solution containing one equivalent weight of solute per litre of solution.
- (organic chemistry) Describing a straight chain isomer of an aliphatic hydrocarbon, or an aliphatic compound in which a substituent is in the 1- position of such a hydrocarbon.
- (physics) (
*Of a mode in an oscillating system*) In which all parts of an object vibrate at the same frequency; See normal mode. - (geometry) Perpendicular to a tangent line or derivative of a surface in Euclidean space.
- (algebra) (Of a subgroup) whose cosets form a group.
- (algebra) (Of a field extension of a field K) which is the splitting field of a family of polynomials in K.
- (probability theory, statistics) (Of a distribution) which has a very specific bell curve shape.
- (complex analysis) (Of a family of continuous functions) which is pre-compact.
- (set theory) (Of a function from the ordinals to the ordinals) which is strictly monotonically increasing and continuous with respect to the order topology.
- (linear algebra) (Of a matrix) which commutes with its conjugate transpose.
- (functional analysis) (Of a Hilbert space operat) which commutes with its adjoint.
- (category theory) (Of an epimorphism) which is the cokernel of some morphism.
- (category theory) (Of a monomorphism) which is the kernel of some morphism.
- (category theory) (Of a morphism) which is a normal epimorphism or a normal monomorphism.
- (category theory) (Of a category) in which every monomorphism is normal.
- (Of a real number) whose digits, in any base representation, enjoy a uniform distribution.
- (topology) (Of a topology) in which disjoint closed sets can be separated by disjoint neighborhoods.
- (rail transport, Of points) in the default position, set for the most frequently used route.

Usage notes

- Warning:
*normal*, when used to describe a majority group of people, can be considered offensive to those who don't consider membership of their own minority to be unusual. Care should be taken when juxtaposing normal, particularly with stereotypical labels, to avoid undue insult.

Noun

(*plural* normals)

- (geometry) A line or vector that is perpendicular to another line, surface, or plane.
- (slang) A person who is normal, who fits into mainstream society, as opposed to those who live alternative lifestyles.

Origin

From Latin *normÄlis*.

## normal - Computer Definition

- Conforming to an accepted, usual, or typical form, model, or pattern.
- In geometry and mathematics, the transverse or perpendicular, i.e., a right angle, which is 90 degrees from a plane or surface. Frankly, this seems decidedly abnormal to me, as I have known a lot of people who seemed to be at right angles compared to normalcy. See also counterintuitive, critical angle, out-of-phase, and total internal reflection.